I'm sure it's underpants, so it's the latter.
Chewing gum though, that's "Chuddy" in the singular, never not no way is it ever pluralised.
But as Messrs
Farty and
ye bongo are clearly on about summat else entirely, meh.
i wish i knew what you were talking about, that would make me a member of the collective
all i want is to be accepted into your super-cool group of chums
please, sir
THERE IS NO CLIQUE.